usr.sbin/nscd/nscd.c

   1 /*-
   2  * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in thereg
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/param.h>
  32 #include <sys/event.h>
  33 #include <sys/socket.h>
  34 #include <sys/stat.h>
  35 #include <sys/time.h>
  36 #include <sys/un.h>
  37
  38 #include <assert.h>
  39 #include <err.h>
  40 #include <errno.h>
  41 #include <fcntl.h>
  42 #include <libutil.h>
  43 #include <pthread.h>
  44 #include <signal.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49
  50 #include "agents/passwd.h"
  51 #include "agents/group.h"
  52 #include "agents/services.h"
  53 #include "cachelib.h"
  54 #include "config.h"
  55 #include "debug.h"
  56 #include "log.h"
  57 #include "nscdcli.h"
  58 #include "parser.h"
  59 #include "query.h"
  60 #include "singletons.h"
  61
  62 #ifndef CONFIG_PATH
  63 #define CONFIG_PATH "/etc/nscd.conf"
  64 #endif
  65 #define DEFAULT_CONFIG_PATH     "nscd.conf"
  66
  67 #define MAX_SOCKET_IO_SIZE      4096
  68
  69 struct processing_thread_args {
  70         cache   the_cache;
  71         struct configuration    *the_configuration;
  72         struct runtime_env              *the_runtime_env;
  73 };
  74
  75 static void accept_connection(struct kevent *, struct runtime_env *,
  76         struct configuration *);
  77 static void destroy_cache_(cache);
  78 static void destroy_runtime_env(struct runtime_env *);
  79 static cache init_cache_(struct configuration *);
  80 static struct runtime_env *init_runtime_env(struct configuration *);
  81 static void processing_loop(cache, struct runtime_env *,
  82         struct configuration *);
  83 static void process_socket_event(struct kevent *, struct runtime_env *,
  84         struct configuration *);
  85 static void process_timer_event(struct kevent *, struct runtime_env *,
  86         struct configuration *);
  87 static void *processing_thread(void *);
  88 static void usage(void);
  89
  90 void get_time_func(struct timeval *);
  91
  92 static void
  93 usage(void)
  94 {
  95         fprintf(stderr,
  96             "usage: nscd [-dnst] [-i cachename] [-I cachename]\n");
  97         exit(1);
  98 }
  99
 100 static cache
 101 init_cache_(struct configuration *config)
 102 {
 103         struct cache_params params;
 104         cache retval;
 105
 106         struct configuration_entry *config_entry;
 107         size_t  size, i;
 108         int res;
 109
 110         TRACE_IN(init_cache_);
 111
 112         memset(&params, 0, sizeof(struct cache_params));
 113         params.get_time_func = get_time_func;
 114         retval = init_cache(&params);
 115
 116         size = configuration_get_entries_size(config);
 117         for (i = 0; i < size; ++i) {
 118                 config_entry = configuration_get_entry(config, i);
 119                 /*
 120                  * We should register common entries now - multipart entries
 121                  * would be registered automatically during the queries.
 122                  */
 123                 res = register_cache_entry(retval, (struct cache_entry_params *)
 124                         &config_entry->positive_cache_params);
 125                 config_entry->positive_cache_entry = find_cache_entry(retval,
 126                         config_entry->positive_cache_params.cep.entry_name);
 127                 assert(config_entry->positive_cache_entry !=
 128                         INVALID_CACHE_ENTRY);
 129
 130                 res = register_cache_entry(retval, (struct cache_entry_params *)
 131                         &config_entry->negative_cache_params);
 132                 config_entry->negative_cache_entry = find_cache_entry(retval,
 133                         config_entry->negative_cache_params.cep.entry_name);
 134                 assert(config_entry->negative_cache_entry !=
 135                         INVALID_CACHE_ENTRY);
 136         }
 137
 138         LOG_MSG_2("cache", "cache was successfully initialized");
 139         TRACE_OUT(init_cache_);
 140         return (retval);
 141 }
 142
 143 static void
 144 destroy_cache_(cache the_cache)
 145 {
 146         TRACE_IN(destroy_cache_);
 147         destroy_cache(the_cache);
 148         TRACE_OUT(destroy_cache_);
 149 }
 150
 151 /*
 152  * Socket and kqueues are prepared here. We have one global queue for both
 153  * socket and timers events.
 154  */
 155 static struct runtime_env *
 156 init_runtime_env(struct configuration *config)
 157 {
 158         int serv_addr_len;
 159         struct sockaddr_un serv_addr;
 160
 161         struct kevent eventlist;
 162         struct timespec timeout;
 163
 164         struct runtime_env *retval;
 165
 166         TRACE_IN(init_runtime_env);
 167         retval = calloc(1, sizeof(*retval));
 168         assert(retval != NULL);
 169
 170         retval->sockfd = socket(PF_LOCAL, SOCK_STREAM, 0);
 171
 172         if (config->force_unlink == 1)
 173                 unlink(config->socket_path);
 174
 175         memset(&serv_addr, 0, sizeof(struct sockaddr_un));
 176         serv_addr.sun_family = PF_LOCAL;
 177         strlcpy(serv_addr.sun_path, config->socket_path,
 178                 sizeof(serv_addr.sun_path));
 179         serv_addr_len = sizeof(serv_addr.sun_family) +
 180                 strlen(serv_addr.sun_path) + 1;
 181
 182         if (bind(retval->sockfd, (struct sockaddr *)&serv_addr,
 183                 serv_addr_len) == -1) {
 184                 close(retval->sockfd);
 185                 free(retval);
 186
 187                 LOG_ERR_2("runtime environment", "can't bind socket to path: "
 188                         "%s", config->socket_path);
 189                 TRACE_OUT(init_runtime_env);
 190                 return (NULL);
 191         }
 192         LOG_MSG_2("runtime environment", "using socket %s",
 193                 config->socket_path);
 194
 195         /*
 196          * Here we're marking socket as non-blocking and setting its backlog
 197          * to the maximum value
 198          */
 199         chmod(config->socket_path, config->socket_mode);
 200         listen(retval->sockfd, -1);
 201         fcntl(retval->sockfd, F_SETFL, O_NONBLOCK);
 202
 203         retval->queue = kqueue();
 204         assert(retval->queue != -1);
 205
 206         EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD | EV_ONESHOT,
 207                 0, 0, 0);
 208         memset(&timeout, 0, sizeof(struct timespec));
 209         kevent(retval->queue, &eventlist, 1, NULL, 0, &timeout);
 210
 211         LOG_MSG_2("runtime environment", "successfully initialized");
 212         TRACE_OUT(init_runtime_env);
 213         return (retval);
 214 }
 215
 216 static void
 217 destroy_runtime_env(struct runtime_env *env)
 218 {
 219         TRACE_IN(destroy_runtime_env);
 220         close(env->queue);
 221         close(env->sockfd);
 222         free(env);
 223         TRACE_OUT(destroy_runtime_env);
 224 }
 225
 226 static void
 227 accept_connection(struct kevent *event_data, struct runtime_env *env,
 228         struct configuration *config)
 229 {
 230         struct kevent   eventlist[2];
 231         struct timespec timeout;
 232         struct query_state      *qstate;
 233
 234         int     fd;
 235         int     res;
 236
 237         uid_t   euid;
 238         gid_t   egid;
 239
 240         TRACE_IN(accept_connection);
 241         fd = accept(event_data->ident, NULL, NULL);
 242         if (fd == -1) {
 243                 LOG_ERR_2("accept_connection", "error %d during accept()",
 244                     errno);
 245                 TRACE_OUT(accept_connection);
 246                 return;
 247         }
 248
 249         if (getpeereid(fd, &euid, &egid) != 0) {
 250                 LOG_ERR_2("accept_connection", "error %d during getpeereid()",
 251                         errno);
 252                 TRACE_OUT(accept_connection);
 253                 return;
 254         }
 255
 256         qstate = init_query_state(fd, sizeof(int), euid, egid);
 257         if (qstate == NULL) {
 258                 LOG_ERR_2("accept_connection", "can't init query_state");
 259                 TRACE_OUT(accept_connection);
 260                 return;
 261         }
 262
 263         memset(&timeout, 0, sizeof(struct timespec));
 264         EV_SET(&eventlist[0], fd, EVFILT_TIMER, EV_ADD | EV_ONESHOT,
 265                 0, qstate->timeout.tv_sec * 1000, qstate);
 266         EV_SET(&eventlist[1], fd, EVFILT_READ, EV_ADD | EV_ONESHOT,
 267                 NOTE_LOWAT, qstate->kevent_watermark, qstate);
 268         res = kevent(env->queue, eventlist, 2, NULL, 0, &timeout);
 269         if (res < 0)
 270                 LOG_ERR_2("accept_connection", "kevent error");
 271
 272         TRACE_OUT(accept_connection);
 273 }
 274
 275 static void
 276 process_socket_event(struct kevent *event_data, struct runtime_env *env,
 277         struct configuration *config)
 278 {
 279         struct kevent   eventlist[2];
 280         struct timeval  query_timeout;
 281         struct timespec kevent_timeout;
 282         int     nevents;
 283         int     eof_res, res;
 284         ssize_t io_res;
 285         struct query_state *qstate;
 286
 287         TRACE_IN(process_socket_event);
 288         eof_res = event_data->flags & EV_EOF ? 1 : 0;
 289         res = 0;
 290
 291         memset(&kevent_timeout, 0, sizeof(struct timespec));
 292         EV_SET(&eventlist[0], event_data->ident, EVFILT_TIMER, EV_DELETE,
 293                 0, 0, NULL);
 294         nevents = kevent(env->queue, eventlist, 1, NULL, 0, &kevent_timeout);
 295         if (nevents == -1) {
 296                 if (errno == ENOENT) {
 297                         /* the timer is already handling this event */
 298                         TRACE_OUT(process_socket_event);
 299                         return;
 300                 } else {
 301                         /* some other error happened */
 302                         LOG_ERR_2("process_socket_event", "kevent error, errno"
 303                                 " is %d", errno);
 304                         TRACE_OUT(process_socket_event);
 305                         return;
 306                 }
 307         }
 308         qstate = (struct query_state *)event_data->udata;
 309
 310         /*
 311          * If the buffer that is to be send/received is too large,
 312          * we send it implicitly, by using query_io_buffer_read and
 313          * query_io_buffer_write functions in the query_state. These functions
 314          * use the temporary buffer, which is later send/received in parts.
 315          * The code below implements buffer splitting/mergind for send/receive
 316          * operations. It also does the actual socket IO operations.
 317          */
 318         if (((qstate->use_alternate_io == 0) &&
 319                 (qstate->kevent_watermark <= (size_t)event_data->data)) ||
 320                 ((qstate->use_alternate_io != 0) &&
 321                 (qstate->io_buffer_watermark <= (size_t)event_data->data))) {
 322                 if (qstate->use_alternate_io != 0) {
 323                         switch (qstate->io_buffer_filter) {
 324                         case EVFILT_READ:
 325                                 io_res = query_socket_read(qstate,
 326                                         qstate->io_buffer_p,
 327                                         qstate->io_buffer_watermark);
 328                                 if (io_res < 0) {
 329                                         qstate->use_alternate_io = 0;
 330                                         qstate->process_func = NULL;
 331                                 } else {
 332                                         qstate->io_buffer_p += io_res;
 333                                         if (qstate->io_buffer_p ==
 334                                                 qstate->io_buffer +
 335                                                 qstate->io_buffer_size) {
 336                                                 qstate->io_buffer_p =
 337                                                     qstate->io_buffer;
 338                                                 qstate->use_alternate_io = 0;
 339                                         }
 340                                 }
 341                         break;
 342                         default:
 343                         break;
 344                         }
 345                 }
 346
 347                 if (qstate->use_alternate_io == 0) {
 348                         do {
 349                                 res = qstate->process_func(qstate);
 350                         } while ((qstate->kevent_watermark == 0) &&
 351                                         (qstate->process_func != NULL) &&
 352                                         (res == 0));
 353
 354                         if (res != 0)
 355                                 qstate->process_func = NULL;
 356                 }
 357
 358                 if ((qstate->use_alternate_io != 0) &&
 359                         (qstate->io_buffer_filter == EVFILT_WRITE)) {
 360                         io_res = query_socket_write(qstate, qstate->io_buffer_p,
 361                                 qstate->io_buffer_watermark);
 362                         if (io_res < 0) {
 363                                 qstate->use_alternate_io = 0;
 364                                 qstate->process_func = NULL;
 365                         } else
 366                                 qstate->io_buffer_p += io_res;
 367                 }
 368         } else {
 369                 /* assuming that socket was closed */
 370                 qstate->process_func = NULL;
 371                 qstate->use_alternate_io = 0;
 372         }
 373
 374         if (((qstate->process_func == NULL) &&
 375                 (qstate->use_alternate_io == 0)) ||
 376                 (eof_res != 0) || (res != 0)) {
 377                 destroy_query_state(qstate);
 378                 close(event_data->ident);
 379                 TRACE_OUT(process_socket_event);
 380                 return;
 381         }
 382
 383         /* updating the query_state lifetime variable */
 384         get_time_func(&query_timeout);
 385         query_timeout.tv_usec = 0;
 386         query_timeout.tv_sec -= qstate->creation_time.tv_sec;
 387         if (query_timeout.tv_sec > qstate->timeout.tv_sec)
 388                 query_timeout.tv_sec = 0;
 389         else
 390                 query_timeout.tv_sec = qstate->timeout.tv_sec -
 391                         query_timeout.tv_sec;
 392
 393         if ((qstate->use_alternate_io != 0) && (qstate->io_buffer_p ==
 394                 qstate->io_buffer + qstate->io_buffer_size))
 395                 qstate->use_alternate_io = 0;
 396
 397         if (qstate->use_alternate_io == 0) {
 398                 /*
 399                  * If we must send/receive the large block of data,
 400                  * we should prepare the query_state's io_XXX fields.
 401                  * We should also substitute its write_func and read_func
 402                  * with the query_io_buffer_write and query_io_buffer_read,
 403                  * which will allow us to implicitly send/receive this large
 404                  * buffer later (in the subsequent calls to the
 405                  * process_socket_event).
 406                  */
 407                 if (qstate->kevent_watermark > MAX_SOCKET_IO_SIZE) {
 408 #if 0
 409                         /*
 410                          * XXX: Uncommenting this code makes nscd(8) fail for
 411                          *      entries larger than a few kB, causing few second
 412                          *      worth of delay for each call to retrieve them.
 413                          */
 414                         if (qstate->io_buffer != NULL)
 415                                 free(qstate->io_buffer);
 416
 417                         qstate->io_buffer = calloc(1,
 418                                 qstate->kevent_watermark);
 419                         assert(qstate->io_buffer != NULL);
 420
 421                         qstate->io_buffer_p = qstate->io_buffer;
 422                         qstate->io_buffer_size = qstate->kevent_watermark;
 423                         qstate->io_buffer_filter = qstate->kevent_filter;
 424
 425                         qstate->write_func = query_io_buffer_write;
 426                         qstate->read_func = query_io_buffer_read;
 427
 428                         if (qstate->kevent_filter == EVFILT_READ)
 429                                 qstate->use_alternate_io = 1;
 430 #endif
 431
 432                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 433                         EV_SET(&eventlist[1], event_data->ident,
 434                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 435                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 436                 } else {
 437                         EV_SET(&eventlist[1], event_data->ident,
 438                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 439                                 NOTE_LOWAT, qstate->kevent_watermark, qstate);
 440                 }
 441         } else {
 442                 if (qstate->io_buffer + qstate->io_buffer_size -
 443                         qstate->io_buffer_p <
 444                         MAX_SOCKET_IO_SIZE) {
 445                         qstate->io_buffer_watermark = qstate->io_buffer +
 446                                 qstate->io_buffer_size - qstate->io_buffer_p;
 447                         EV_SET(&eventlist[1], event_data->ident,
 448                                 qstate->io_buffer_filter,
 449                                 EV_ADD | EV_ONESHOT, NOTE_LOWAT,
 450                                 qstate->io_buffer_watermark,
 451                                 qstate);
 452                 } else {
 453                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 454                         EV_SET(&eventlist[1], event_data->ident,
 455                                 qstate->io_buffer_filter, EV_ADD | EV_ONESHOT,
 456                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 457                 }
 458         }
 459         EV_SET(&eventlist[0], event_data->ident, EVFILT_TIMER,
 460                 EV_ADD | EV_ONESHOT, 0, query_timeout.tv_sec * 1000, qstate);
 461         kevent(env->queue, eventlist, 2, NULL, 0, &kevent_timeout);
 462
 463         TRACE_OUT(process_socket_event);
 464 }
 465
 466 /*
 467  * This routine is called if timer event has been signaled in the kqueue. It
 468  * just closes the socket and destroys the query_state.
 469  */
 470 static void
 471 process_timer_event(struct kevent *event_data, struct runtime_env *env,
 472         struct configuration *config)
 473 {
 474         struct query_state      *qstate;
 475
 476         TRACE_IN(process_timer_event);
 477         qstate = (struct query_state *)event_data->udata;
 478         destroy_query_state(qstate);
 479         close(event_data->ident);
 480         TRACE_OUT(process_timer_event);
 481 }
 482
 483 /*
 484  * Processing loop is the basic processing routine, that forms a body of each
 485  * procssing thread
 486  */
 487 static void
 488 processing_loop(cache the_cache, struct runtime_env *env,
 489         struct configuration *config)
 490 {
 491         struct timespec timeout;
 492         const int eventlist_size = 1;
 493         struct kevent eventlist[eventlist_size];
 494         int nevents, i;
 495
 496         TRACE_MSG("=> processing_loop");
 497         memset(&timeout, 0, sizeof(struct timespec));
 498         memset(&eventlist, 0, sizeof(struct kevent) * eventlist_size);
 499
 500         for (;;) {
 501                 nevents = kevent(env->queue, NULL, 0, eventlist,
 502                         eventlist_size, NULL);
 503                 /*
 504                  * we can only receive 1 event on success
 505                  */
 506                 if (nevents == 1) {
 507                         struct kevent *event_data;
 508                         event_data = &eventlist[0];
 509
 510                         if ((int)event_data->ident == env->sockfd) {
 511                                 for (i = 0; i < event_data->data; ++i)
 512                                     accept_connection(event_data, env, config);
 513
 514                                 EV_SET(eventlist, s_runtime_env->sockfd,
 515                                     EVFILT_READ, EV_ADD | EV_ONESHOT,
 516                                     0, 0, 0);
 517                                 memset(&timeout, 0,
 518                                     sizeof(struct timespec));
 519                                 kevent(s_runtime_env->queue, eventlist,
 520                                     1, NULL, 0, &timeout);
 521
 522                         } else {
 523                                 switch (event_data->filter) {
 524                                 case EVFILT_READ:
 525                                 case EVFILT_WRITE:
 526                                         process_socket_event(event_data,
 527                                                 env, config);
 528                                         break;
 529                                 case EVFILT_TIMER:
 530                                         process_timer_event(event_data,
 531                                                 env, config);
 532                                         break;
 533                                 default:
 534                                         break;
 535                                 }
 536                         }
 537                 } else {
 538                         /* this branch shouldn't be currently executed */
 539                 }
 540         }
 541
 542         TRACE_MSG("<= processing_loop");
 543 }
 544
 545 /*
 546  * Wrapper above the processing loop function. It sets the thread signal mask
 547  * to avoid SIGPIPE signals (which can happen if the client works incorrectly).
 548  */
 549 static void *
 550 processing_thread(void *data)
 551 {
 552         struct processing_thread_args   *args;
 553         sigset_t new;
 554
 555         TRACE_MSG("=> processing_thread");
 556         args = (struct processing_thread_args *)data;
 557
 558         sigemptyset(&new);
 559         sigaddset(&new, SIGPIPE);
 560         if (pthread_sigmask(SIG_BLOCK, &new, NULL) != 0)
 561                 LOG_ERR_1("processing thread",
 562                         "thread can't block the SIGPIPE signal");
 563
 564         processing_loop(args->the_cache, args->the_runtime_env,
 565                 args->the_configuration);
 566         free(args);
 567         TRACE_MSG("<= processing_thread");
 568
 569         return (NULL);
 570 }
 571
 572 void
 573 get_time_func(struct timeval *time)
 574 {
 575         struct timespec res;
 576         memset(&res, 0, sizeof(struct timespec));
 577         clock_gettime(CLOCK_MONOTONIC, &res);
 578
 579         time->tv_sec = res.tv_sec;
 580         time->tv_usec = 0;
 581 }
 582
 583 /*
 584  * The idea of _nss_cache_cycle_prevention_function is that nsdispatch
 585  * will search for this symbol in the executable. This symbol is the
 586  * attribute of the caching daemon. So, if it exists, nsdispatch won't try
 587  * to connect to the caching daemon and will just ignore the 'cache'
 588  * source in the nsswitch.conf. This method helps to avoid cycles and
 589  * organize self-performing requests.
 590  *
 591  * (not actually a function; it used to be, but it doesn't make any
 592  * difference, as long as it has external linkage)
 593  */
 594 void *_nss_cache_cycle_prevention_function;
 595
 596 int
 597 main(int argc, char *argv[])
 598 {
 599         struct processing_thread_args *thread_args;
 600         pthread_t *threads;
 601
 602         struct pidfh *pidfile;
 603         pid_t pid;
 604
 605         char const *config_file;
 606         char const *error_str;
 607         int error_line;
 608         int i, res;
 609
 610         int trace_mode_enabled;
 611         int force_single_threaded;
 612         int do_not_daemonize;
 613         int clear_user_cache_entries, clear_all_cache_entries;
 614         char *user_config_entry_name, *global_config_entry_name;
 615         int show_statistics;
 616         int daemon_mode, interactive_mode;
 617
 618
 619         /* by default all debug messages are omitted */
 620         TRACE_OFF();
 621
 622         /* parsing command line arguments */
 623         trace_mode_enabled = 0;
 624         force_single_threaded = 0;
 625         do_not_daemonize = 0;
 626         clear_user_cache_entries = 0;
 627         clear_all_cache_entries = 0;
 628         show_statistics = 0;
 629         user_config_entry_name = NULL;
 630         global_config_entry_name = NULL;
 631         while ((res = getopt(argc, argv, "nstdi:I:")) != -1) {
 632                 switch (res) {
 633                 case 'n':
 634                         do_not_daemonize = 1;
 635                         break;
 636                 case 's':
 637                         force_single_threaded = 1;
 638                         break;
 639                 case 't':
 640                         trace_mode_enabled = 1;
 641                         break;
 642                 case 'i':
 643                         clear_user_cache_entries = 1;
 644                         if (optarg != NULL)
 645                                 if (strcmp(optarg, "all") != 0)
 646                                         user_config_entry_name = strdup(optarg);
 647                         break;
 648                 case 'I':
 649                         clear_all_cache_entries = 1;
 650                         if (optarg != NULL)
 651                                 if (strcmp(optarg, "all") != 0)
 652                                         global_config_entry_name =
 653                                                 strdup(optarg);
 654                         break;
 655                 case 'd':
 656                         show_statistics = 1;
 657                         break;
 658                 case '?':
 659                 default:
 660                         usage();
 661                         /* NOT REACHED */
 662                 }
 663         }
 664
 665         daemon_mode = do_not_daemonize | force_single_threaded |
 666                 trace_mode_enabled;
 667         interactive_mode = clear_user_cache_entries | clear_all_cache_entries |
 668                 show_statistics;
 669
 670         if ((daemon_mode != 0) && (interactive_mode != 0)) {
 671                 LOG_ERR_1("main", "daemon mode and interactive_mode arguments "
 672                         "can't be used together");
 673                 usage();
 674         }
 675
 676         if (interactive_mode != 0) {
 677                 FILE *pidfin = fopen(DEFAULT_PIDFILE_PATH, "r");
 678                 char pidbuf[256];
 679
 680                 struct nscd_connection_params connection_params;
 681                 nscd_connection connection;
 682
 683                 int result;
 684
 685                 if (pidfin == NULL)
 686                         errx(EXIT_FAILURE, "There is no daemon running.");
 687
 688                 memset(pidbuf, 0, sizeof(pidbuf));
 689                 fread(pidbuf, sizeof(pidbuf) - 1, 1, pidfin);
 690                 fclose(pidfin);
 691
 692                 if (ferror(pidfin) != 0)
 693                         errx(EXIT_FAILURE, "Can't read from pidfile.");
 694
 695                 if (sscanf(pidbuf, "%d", &pid) != 1)
 696                         errx(EXIT_FAILURE, "Invalid pidfile.");
 697                 LOG_MSG_1("main", "daemon PID is %d", pid);
 698
 699
 700                 memset(&connection_params, 0,
 701                         sizeof(struct nscd_connection_params));
 702                 connection_params.socket_path = DEFAULT_SOCKET_PATH;
 703                 connection = open_nscd_connection__(&connection_params);
 704                 if (connection == INVALID_NSCD_CONNECTION)
 705                         errx(EXIT_FAILURE, "Can't connect to the daemon.");
 706
 707                 if (clear_user_cache_entries != 0) {
 708                         result = nscd_transform__(connection,
 709                                 user_config_entry_name, TT_USER);
 710                         if (result != 0)
 711                                 LOG_MSG_1("main",
 712                                         "user cache transformation failed");
 713                         else
 714                                 LOG_MSG_1("main",
 715                                         "user cache_transformation "
 716                                         "succeeded");
 717                 }
 718
 719                 if (clear_all_cache_entries != 0) {
 720                         if (geteuid() != 0)
 721                                 errx(EXIT_FAILURE, "Only root can initiate "
 722                                         "global cache transformation.");
 723
 724                         result = nscd_transform__(connection,
 725                                 global_config_entry_name, TT_ALL);
 726                         if (result != 0)
 727                                 LOG_MSG_1("main",
 728                                         "global cache transformation "
 729                                         "failed");
 730                         else
 731                                 LOG_MSG_1("main",
 732                                         "global cache transformation "
 733                                         "succeeded");
 734                 }
 735
 736                 close_nscd_connection__(connection);
 737
 738                 free(user_config_entry_name);
 739                 free(global_config_entry_name);
 740                 return (EXIT_SUCCESS);
 741         }
 742
 743         pidfile = pidfile_open(DEFAULT_PIDFILE_PATH, 0644, &pid);
 744         if (pidfile == NULL) {
 745                 if (errno == EEXIST)
 746                         errx(EXIT_FAILURE, "Daemon already running, pid: %d.",
 747                                 pid);
 748                 warn("Cannot open or create pidfile");
 749         }
 750
 751         if (trace_mode_enabled == 1)
 752                 TRACE_ON();
 753
 754         /* blocking the main thread from receiving SIGPIPE signal */
 755         sigblock(sigmask(SIGPIPE));
 756
 757         /* daemonization */
 758         if (do_not_daemonize == 0) {
 759                 res = daemon(0, trace_mode_enabled == 0 ? 0 : 1);
 760                 if (res != 0) {
 761                         LOG_ERR_1("main", "can't daemonize myself: %s",
 762                                 strerror(errno));
 763                         pidfile_remove(pidfile);
 764                         goto fin;
 765                 } else
 766                         LOG_MSG_1("main", "successfully daemonized");
 767         }
 768
 769         pidfile_write(pidfile);
 770
 771         s_agent_table = init_agent_table();
 772         register_agent(s_agent_table, init_passwd_agent());
 773         register_agent(s_agent_table, init_passwd_mp_agent());
 774         register_agent(s_agent_table, init_group_agent());
 775         register_agent(s_agent_table, init_group_mp_agent());
 776         register_agent(s_agent_table, init_services_agent());
 777         register_agent(s_agent_table, init_services_mp_agent());
 778         LOG_MSG_1("main", "request agents registered successfully");
 779
 780         /*
 781          * Hosts agent can't work properly until we have access to the
 782          * appropriate dtab structures, which are used in nsdispatch
 783          * calls
 784          *
 785          register_agent(s_agent_table, init_hosts_agent());
 786         */
 787
 788         /* configuration initialization */
 789         s_configuration = init_configuration();
 790         fill_configuration_defaults(s_configuration);
 791
 792         error_str = NULL;
 793         error_line = 0;
 794         config_file = CONFIG_PATH;
 795
 796         res = parse_config_file(s_configuration, config_file, &error_str,
 797                 &error_line);
 798         if ((res != 0) && (error_str == NULL)) {
 799                 config_file = DEFAULT_CONFIG_PATH;
 800                 res = parse_config_file(s_configuration, config_file,
 801                         &error_str, &error_line);
 802         }
 803
 804         if (res != 0) {
 805                 if (error_str != NULL) {
 806                 LOG_ERR_1("main", "error in configuration file(%s, %d): %s\n",
 807                         config_file, error_line, error_str);
 808                 } else {
 809                 LOG_ERR_1("main", "no configuration file found "
 810                         "- was looking for %s and %s",
 811                         CONFIG_PATH, DEFAULT_CONFIG_PATH);
 812                 }
 813                 destroy_configuration(s_configuration);
 814                 return (-1);
 815         }
 816
 817         if (force_single_threaded == 1)
 818                 s_configuration->threads_num = 1;
 819
 820         /* cache initialization */
 821         s_cache = init_cache_(s_configuration);
 822         if (s_cache == NULL) {
 823                 LOG_ERR_1("main", "can't initialize the cache");
 824                 destroy_configuration(s_configuration);
 825                 return (-1);
 826         }
 827
 828         /* runtime environment initialization */
 829         s_runtime_env = init_runtime_env(s_configuration);
 830         if (s_runtime_env == NULL) {
 831                 LOG_ERR_1("main", "can't initialize the runtime environment");
 832                 destroy_configuration(s_configuration);
 833                 destroy_cache_(s_cache);
 834                 return (-1);
 835         }
 836
 837         if (s_configuration->threads_num > 1) {
 838                 threads = calloc(s_configuration->threads_num,
 839                         sizeof(*threads));
 840                 for (i = 0; i < s_configuration->threads_num; ++i) {
 841                         thread_args = malloc(
 842                                 sizeof(*thread_args));
 843                         thread_args->the_cache = s_cache;
 844                         thread_args->the_runtime_env = s_runtime_env;
 845                         thread_args->the_configuration = s_configuration;
 846
 847                         LOG_MSG_1("main", "thread #%d was successfully created",
 848                                 i);
 849                         pthread_create(&threads[i], NULL, processing_thread,
 850                                 thread_args);
 851
 852                         thread_args = NULL;
 853                 }
 854
 855                 for (i = 0; i < s_configuration->threads_num; ++i)
 856                         pthread_join(threads[i], NULL);
 857         } else {
 858                 LOG_MSG_1("main", "working in single-threaded mode");
 859                 processing_loop(s_cache, s_runtime_env, s_configuration);
 860         }
 861
 862 fin:
 863         /* runtime environment destruction */
 864         destroy_runtime_env(s_runtime_env);
 865
 866         /* cache destruction */
 867         destroy_cache_(s_cache);
 868
 869         /* configuration destruction */
 870         destroy_configuration(s_configuration);
 871
 872         /* agents table destruction */
 873         destroy_agent_table(s_agent_table);
 874
 875         pidfile_remove(pidfile);
 876         return (EXIT_SUCCESS);
 877 }